US20090201154A1 - Apparatus for securing a land surveyor's mark based on the use of a radio frequency identifier tag - Google Patents
Apparatus for securing a land surveyor's mark based on the use of a radio frequency identifier tag Download PDFInfo
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- US20090201154A1 US20090201154A1 US12/306,272 US30627207A US2009201154A1 US 20090201154 A1 US20090201154 A1 US 20090201154A1 US 30627207 A US30627207 A US 30627207A US 2009201154 A1 US2009201154 A1 US 2009201154A1
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- mark
- stick
- head
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- ground
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/02—Means for marking measuring points
- G01C15/04—Permanent marks; Boundary markers
Definitions
- the present invention relates to Geomatics Engineering and Land Information Management more particularly to land, cadastral and engineering surveying.
- the present invention discloses an apparatus for securing a land surveyor's mark based on the use of a RFID tag (Radio Frequency IDentifier).
- RFID tag Radio Frequency IDentifier
- Geomatics Engineering is a rapidly developing discipline that focuses on spatial information (i.e. information that has a location). The location is the primary factor used to integrate a very wide range of data for viewing and analysis. Engineering principles are applied to spatial information in order to implement relational data structures involving measurement sciences.
- Geomatics engineers manage local, regional, national and global spatial data infrastructures.
- Geomatics Engineering is a new expression incorporating what used to be called “Surveying” along with many other aspects of spatial data management. Following the advanced developments in digital data processing, the nature of the tasks required of the Professional Land Surveyor has evolved and the term Surveying alone does not anymore describe the whole range of tasks that the profession deals with. As our societies have become more complex, information with a spatial position associated with it has become more critical to decision-making, from a personal and a business perspective, and a community and a large-scale governmental viewpoint. Therefore the variety of information-gathering activities and applications with which the Geomatics Engineer can be involved is extremely wide. Geomatics engineers design, develop, and operate systems for collecting and analyzing spatial information about the land, the oceans, natural resources, fixed assets and the environment in general. Geomatics Engineering applications include, but are not limited to, integrating science and technology from the new and traditional disciplines of:
- Geomatics Engineers serve society by collecting, monitoring, archiving and maintaining diverse spatial data infrastructures. Geomatics engineers utilize a wide range of technologically advanced tools such as digital theodolite/distance meter total stations, Global Positioning System (GPS) equipment, digital aerial imagery (both satellite and air-borne), and computer-based geographic information systems (GIS). These tools enable the Geomatics Engineer to gather, analyze, and manage spatially related information to solve a wide range of technical and societal problems.
- GPS Global Positioning System
- GIS geographic information systems
- Geomatics Engineering is the field of activity that integrates the acquisition, processing, analysis, display and management of spatial information.
- the main problem that the prior art proposes to solve is to prevent surveyor's marks from being pulled up from the ground.
- the mechanical security of surveyor's marks is ensured by using stakes with some physical features like points of harpoon.
- the present invention is directed to a mark as defined in independent claims.
- the mark according to the present invention comprises two parts, a first part intended to be planted in the ground and a second part assembled on the top of said first part.
- the mark is characterized in that:
- This invention has many advantages as will be explained further below.
- FIG. 1 is a general view of the mechanical assembly according to the present invention.
- FIG. 2 is view of the disassembled surveyor's mark according to the present invention.
- FIGS. 3( a ) and 3 ( b ) illustrates a possible implementation of the electric circuitry in the RFID tag according to the present invention.
- the present invention relates to Geomatics Engineering and more particularly to “Land Information Management” such as surveying, including land, cadastral and engineering surveying.
- the present invention discloses an apparatus comprising means for:
- the surveyor's mark according to the present invention has the following characteristics:
- the present invention is based on the RFID technology.
- the secured mark has the shape of a “stake” or “peg” ( 100 ).
- the mark is made of non-oxidizing metal, and is composed of two pieces :
- FIGS. 1 and 2 show also how the mechanical assembly is maintained and goes off if the mark's head is pulled up.
- a RFID tag ( 150 ) is imbedded into the stake head ( 105 ), and securely sealed with a material like epoxy resin.
- a tinny wire ( 151 ) making an electrical conducting loop is connected to the chip of the RFID tag ( 150 ). The loop is sealed into a cavity in the stick of the mark.
- the tinny wire ( 151 ) will break, the electrical circuit made by the tinny wire ( 151 ) will be open and the RFID code will change.
- the RFID tag will then give a different code (ID number) when it will be read.
- FIGS. 3( a ) and 3 ( b ) illustrate a possible implementation of the electric circuitry in the RFID tag ( 150 ), where the last bit (LSB) of the register ( 332 ), is flipped from the value 0 to the value 1 when the tinny wire ( 151 ) is broken.
- a Radio Frequency IDentifier (RFID) tag is imbedded in the stake head and securely sealed.
- the core of any RFID system is the ‘Tag’ or ‘Transponder’, which can be attached to or embedded within objects, wherein data can be stored.
- An RFID reader generically referred to as reader in the following description, sends out a radio frequency signal to the RFID tag that broadcasts back its stored data to the reader.
- the system works basically as two separate antennas, one on the RFID tag and the other on the reader.
- the read data can either be transmitted directly to another system like a host computer through standard interfaces, or it can be stored in a portable reader and later uploaded to the computer for data processing.
- An RFID tag system works effectively in environments with excessive dirt, dust, moisture, and/or poor visibility. It generally overcomes the limitations of other automatic identification approaches.
- RFID tags do not require battery for transmission since generally, they are powered by the reader using an induction mechanism (an electromagnetic or magnetic field is emitted by the reader antenna and received by an antenna localized on the RFID tag). This power is used by the RFID tag to transmit a signal back to the reader, carrying the data stored in the RFID tag.
- Active RFID tags comprise a battery to transmit a signal to a reader. A signal is emitted at a predefined interval or transmit only when addressed by a reader.
- the reader sends out a power pulse to the RFID antenna.
- the electro-magnetic field generated is ‘collected’ by the antenna in the RFID tag that is tuned to the same frequency.
- the RFID tag immediately transmits back is data. This data is picked up by the receiving antenna and decoded by the reader.
- RFID tags can be read-only, write-once, or read-write.
- the RFID tag ( 150 ) comprises a circuit having three nodes ( 322 ), ( 324 ) and ( 326 ).
- An RFID tag can be identified by means of its code (or ID number) ( 330 ).
- the ID number ( 330 ) (of which only last byte is shown in FIG.
- LSB least significant bit
- the thin wire loop ( 151 ) forms an electrical connection with the RFID tag ( 150 ).
- the thin wire loop ( 151 ) is connected between nodes ( 324 ) and ( 326 ), to connect the voltage to ground. Accordingly, the electrical connection formed by the intact thin wire loop ( 151 ) ensures that the voltage setting the LSB (tamper indicator bit) of the tag's memory register has a low-level. This results in an even tag ID number ( 330 ).
- the thin wire loop ( 151 ) and the electrical connection with the RFID tag ( 150 ) is broken (i.e. the voltage is not connected to ground). Consequently, the voltage setting the LSB of the tag's memory register ( 332 ) attains a high value. The tamper indicator bit value is flipped, this results in an odd tag ID number.
- a RFID tag in a surveyor's mark answers a reader with an even identification code number after being positioned for the first time and an odd number if the mark has been disassembled.
- the breaking of the thin wire loop ( 151 ) modifies the response returned by the RFID tag ( 150 ) when read, so that, even if the mark is reassembled into its original state, the RFID tag will still report the disassembling of the mark.
- Information can be entered in the RFID tag by the land surveyor who is doing the marking work, in a non volatile memory of the tag.
- the information is stored once the mark has been deep-set in the ground using a portable RFID reader/Writer. Once written the information cannot be modified (case of a “Write once/read many” type of RFID tag).
- the RFID may contain the following information:
- a series of marks delimiting an area can be read automatically and quickly by just passing nearby with an handheld RFID reader.
- the information stored in the reader can then be transferred to a computer.
- the reader is wirelessly connected to the computer (a wire-connected reader would not be practical). Thanks to the present invention it is possible to automatically and dynamically build a map and to save time compared with traditional methods.
- the position of the mark is certified by the fact that the “tamper indicator bit” has still its original value.
- the collect of the information can be executed by a non-professional operator.
Abstract
Description
- The present invention relates to Geomatics Engineering and Land Information Management more particularly to land, cadastral and engineering surveying. The present invention discloses an apparatus for securing a land surveyor's mark based on the use of a RFID tag (Radio Frequency IDentifier).
- Geomatics Engineering is a rapidly developing discipline that focuses on spatial information (i.e. information that has a location). The location is the primary factor used to integrate a very wide range of data for viewing and analysis. Engineering principles are applied to spatial information in order to implement relational data structures involving measurement sciences.
- Geomatics engineers manage local, regional, national and global spatial data infrastructures.
- Geomatics Engineering is a new expression incorporating what used to be called “Surveying” along with many other aspects of spatial data management. Following the advanced developments in digital data processing, the nature of the tasks required of the Professional Land Surveyor has evolved and the term Surveying alone does not anymore describe the whole range of tasks that the profession deals with. As our societies have become more complex, information with a spatial position associated with it has become more critical to decision-making, from a personal and a business perspective, and a community and a large-scale governmental viewpoint. Therefore the variety of information-gathering activities and applications with which the Geomatics Engineer can be involved is extremely wide. Geomatics engineers design, develop, and operate systems for collecting and analyzing spatial information about the land, the oceans, natural resources, fixed assets and the environment in general. Geomatics Engineering applications include, but are not limited to, integrating science and technology from the new and traditional disciplines of:
-
- Geodesy and Geodetic Science,
- Cartography, computer and digital mapping,
- Remote sensing, Photogrammetry (photogrammetric mapping),
- Land Information Systems (LIS) and Land Information Science,
- Land Information Management,
- Real Property boundary determination,
- Hydrography, Navigation, Topographic and Spatial Computing,
- Surveying (including land, cadastral, aerial, mining and engineering surveying),
- Construction layout, route design,
- Image Understanding and Computer Aided Visualization,
- Computer Aided Design (CAD),
- Geographic Information Systems (GIS), and Geographic Information Science,
- Global Positioning System (GPS), . . .
- The more traditional Land Surveying strand of Geomatics Engineering is concerned with the determination and recording of boundaries and areas of real property parcels, and the preparation and interpretation of legal land descriptions. The tasks more closely related to Civil Engineering include the design and layout of public infrastructure and urban subdivisions, and mapping and control surveys for engineering projects. Geomatics Engineers serve society by collecting, monitoring, archiving and maintaining diverse spatial data infrastructures. Geomatics engineers utilize a wide range of technologically advanced tools such as digital theodolite/distance meter total stations, Global Positioning System (GPS) equipment, digital aerial imagery (both satellite and air-borne), and computer-based geographic information systems (GIS). These tools enable the Geomatics Engineer to gather, analyze, and manage spatially related information to solve a wide range of technical and societal problems.
- Geomatics Engineering is the field of activity that integrates the acquisition, processing, analysis, display and management of spatial information.
- Currently, in “Real property boundary determination and marking”, the first and mandatory activity of a land surveyor is to find and identify on the ground any already existing “surveyor's marks”. In fact this is a legal obligation (however, low may vary depending on the country), to link his work to any previous surveying work that may have been done in the past, in the same or adjacent areas. Public marks are very well identified and the practitioner can easily find in the public records the characteristics of such a mark (exact geographical position and elevation).
- In contrast, in the private domain it is sometimes extremely difficult, once a previous surveyor's mark is found, to know what it delimits. Most of the time, the only way to determine what an existing mark indicates, is to find who is the professional who had positioned this mark. Finding the Practitioner who did position the found marks can take a very long time, and be very costly, sometimes it is even impossible. Moreover, the mark may have been pooled out and moved, and it is not obvious to discover that.
- The main problem that the prior art proposes to solve is to prevent surveyor's marks from being pulled up from the ground. The mechanical security of surveyor's marks is ensured by using stakes with some physical features like points of harpoon.
- The present invention is directed to a mark as defined in independent claims.
- The mark according to the present invention comprises two parts, a first part intended to be planted in the ground and a second part assembled on the top of said first part. The mark is characterized in that:
-
- a tag, preferably a RFID tag, which code value can be read by an appropriate wireless device, is imbedded and sealed in the second part of the mark;
- a tinny wire sealed in the first part of the mark and making an electrical conducting loop is connected to the tag, said tag having a first code value when said loop is closed and having a second code value when the loop is open;
wherein, when the first part is firmly planted in the ground, pulling the head in order to pull up the mark will result in - disassembling the two parts of the mark;
- breaking the tinny wire and opening of the loop; and thus
- changing the code value of the tag.
- Further embodiments of the invention are provided in the appended dependent claims.
- This invention has many advantages as will be explained further below.
- The foregoing, together with other objects, features, and advantages of this invention can be better appreciated with reference to the following specification, claims and drawings.
- The new and inventive features believed characteristics of the invention are set forth in the appended claims. The invention itself, however, as well as a preferred mode of use, further objects and advantages thereof, will best be understood by reference to the following detailed description of an illustrative detailed embodiment when read in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a general view of the mechanical assembly according to the present invention. -
FIG. 2 is view of the disassembled surveyor's mark according to the present invention. -
FIGS. 3( a) and 3(b) illustrates a possible implementation of the electric circuitry in the RFID tag according to the present invention. - The present invention relates to Geomatics Engineering and more particularly to “Land Information Management” such as surveying, including land, cadastral and engineering surveying. The present invention discloses an apparatus comprising means for:
- 1—Immediately Retrieving Information Related to a Surveyor's Mark:
-
- position of the mark (geographical coordinates),
- elevation of the mark,
- identification of the mark,
- identification of the surveyor who positioned the mark (or professional responsible of the mark),
- . . . ,
- 2—Determining Whether or not the Mark has Been Moved.
- The surveyor's mark according to the present invention has the following characteristics:
-
- A RFID (Radio Frequency IDentifier) tag is embedded in the surveyor's mark. This RFID tag comprises information related to the mark. This information is written (and signed) by the surveyor who positioned it.
- Once the mark has been positioned, the information in the RFID tag cannot be modified anymore.
- The RFID tag is embedded using a process that guarantee its duration over time.
- Any malicious action aiming at moving (pulling up) the mark will be detected and reported by the RFID tag when it will be read.
- The present invention is based on the RFID technology. As shown in
FIG. 1 , the secured mark has the shape of a “stake” or “peg” (100). The mark is made of non-oxidizing metal, and is composed of two pieces : -
- A head (105) and a stick (110) are assembled together thanks to a specific mechanism (130), in such a way that if the stick is firmly deep-set in the ground, pulling the head in order to dig out the mark will result in the disassembly of the two parts (head and stick) of the mark as shown in
FIG. 2 . The mechanism (130), is a classical system based on springs embedded into the mark head. The springs firmly push balls into small cavities in the mark stick. The strength of the springs is calibrated to guarantee that the head and the stick will be disassembled, before the stick can be extracted from the ground. - A harpoon system (120) is also added to the top of the stick to ensure that the pulling up of the mark is not possible without disassembling the apparatus.
- A head (105) and a stick (110) are assembled together thanks to a specific mechanism (130), in such a way that if the stick is firmly deep-set in the ground, pulling the head in order to dig out the mark will result in the disassembly of the two parts (head and stick) of the mark as shown in
-
FIGS. 1 and 2 show also how the mechanical assembly is maintained and goes off if the mark's head is pulled up. - A RFID tag (150) is imbedded into the stake head (105), and securely sealed with a material like epoxy resin. A tinny wire (151) making an electrical conducting loop, is connected to the chip of the RFID tag (150). The loop is sealed into a cavity in the stick of the mark. As shown in
FIG. 2 , in case of disassembly of the mark's head (105) and stick (110), the tinny wire (151) will break, the electrical circuit made by the tinny wire (151) will be open and the RFID code will change. As illustrated inFIGS. 3( a) and 3(b), the RFID tag will then give a different code (ID number) when it will be read. -
FIGS. 3( a) and 3(b) illustrate a possible implementation of the electric circuitry in the RFID tag (150), where the last bit (LSB) of the register (332), is flipped from thevalue 0 to thevalue 1 when the tinny wire (151) is broken. - According to the invention, a Radio Frequency IDentifier (RFID) tag is imbedded in the stake head and securely sealed.
- The core of any RFID system is the ‘Tag’ or ‘Transponder’, which can be attached to or embedded within objects, wherein data can be stored. An RFID reader, generically referred to as reader in the following description, sends out a radio frequency signal to the RFID tag that broadcasts back its stored data to the reader. The system works basically as two separate antennas, one on the RFID tag and the other on the reader. The read data can either be transmitted directly to another system like a host computer through standard interfaces, or it can be stored in a portable reader and later uploaded to the computer for data processing. An RFID tag system works effectively in environments with excessive dirt, dust, moisture, and/or poor visibility. It generally overcomes the limitations of other automatic identification approaches.
- Several kinds of RFID, such as piezoelectric RFID and electronic RFID, are currently available. For example, passive RFID tags do not require battery for transmission since generally, they are powered by the reader using an induction mechanism (an electromagnetic or magnetic field is emitted by the reader antenna and received by an antenna localized on the RFID tag). This power is used by the RFID tag to transmit a signal back to the reader, carrying the data stored in the RFID tag. Active RFID tags comprise a battery to transmit a signal to a reader. A signal is emitted at a predefined interval or transmit only when addressed by a reader.
- When a passive High Frequency (HF) RFID tag is to be read, the reader sends out a power pulse to the RFID antenna. The electro-magnetic field generated is ‘collected’ by the antenna in the RFID tag that is tuned to the same frequency. When the power pulse has finished, the RFID tag immediately transmits back is data. This data is picked up by the receiving antenna and decoded by the reader.
- RFID tags can be read-only, write-once, or read-write.
- Referring to
FIG. 3 a, the RFID tag (150) according to the present invention comprises a circuit having three nodes (322), (324) and (326). The internal RFID tag's memory register (332), (of which only last byte is shown inFIG. 3 ), is connected to a load resistor R and the load resistor is in turn connected between nodes (322) and (324). An RFID tag can be identified by means of its code (or ID number) (330). The ID number (330) (of which only last byte is shown inFIG. 3 ), is generally stored in a memory (EEPROM or FRAM) in the RFID tag (150), and transferred to the tag's memory register (332) (on receipt of an incoming RF signal transporting a “read” command) for subsequent transmission to a reader (not shown). In the present case, the least significant bit (LSB) of the tag's memory register (332) is connected to node (324). - When the surveyor's mark is positioned for the first time and sealed, the thin wire loop (151) forms an electrical connection with the RFID tag (150). The thin wire loop (151) is connected between nodes (324) and (326), to connect the voltage to ground. Accordingly, the electrical connection formed by the intact thin wire loop (151) ensures that the voltage setting the LSB (tamper indicator bit) of the tag's memory register has a low-level. This results in an even tag ID number (330).
- However, referring to
FIG. 3( b), if the mark is disassembled, the thin wire loop (151) and the electrical connection with the RFID tag (150) is broken (i.e. the voltage is not connected to ground). Consequently, the voltage setting the LSB of the tag's memory register (332) attains a high value. The tamper indicator bit value is flipped, this results in an odd tag ID number. - In conclusion, a RFID tag in a surveyor's mark answers a reader with an even identification code number after being positioned for the first time and an odd number if the mark has been disassembled. In other words, the breaking of the thin wire loop (151) modifies the response returned by the RFID tag (150) when read, so that, even if the mark is reassembled into its original state, the RFID tag will still report the disassembling of the mark.
- Information can be entered in the RFID tag by the land surveyor who is doing the marking work, in a non volatile memory of the tag. The information is stored once the mark has been deep-set in the ground using a portable RFID reader/Writer. Once written the information cannot be modified (case of a “Write once/read many” type of RFID tag). For instance, the RFID may contain the following information:
-
- an identifier of the mark (a unique serial number per manufacturer). A specific bit of the identifier can be defined as a tamper indicator bit. This bit is flipped from 0 to 1 or from 1 to 0 depending on the convention, if the mark is tampered;
- geographical coordinates, and elevation of the mark;
- a reference number of the marking work;
- the date of the marking work;
- an identification of the Geomatics Engineer (Land Surveyor), . . .
- A series of marks delimiting an area, can be read automatically and quickly by just passing nearby with an handheld RFID reader. The information stored in the reader can then be transferred to a computer. In a preferred embodiment the reader is wirelessly connected to the computer (a wire-connected reader would not be practical). Thanks to the present invention it is possible to automatically and dynamically build a map and to save time compared with traditional methods.
- The position of the mark is certified by the fact that the “tamper indicator bit” has still its original value.
- Moreover, the collect of the information can be executed by a non-professional operator.
- While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood that various changes in form and detail may be made therein without departing from the spirit, and scope of the invention.
Claims (21)
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Also Published As
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EP2035775B1 (en) | 2009-12-16 |
US8289167B2 (en) | 2012-10-16 |
US8610581B2 (en) | 2013-12-17 |
CN101410693A (en) | 2009-04-15 |
CN101410693B (en) | 2012-01-25 |
US20120326872A1 (en) | 2012-12-27 |
EP2035775A1 (en) | 2009-03-18 |
WO2008000533A1 (en) | 2008-01-03 |
DE602007003839D1 (en) | 2010-01-28 |
ATE452325T1 (en) | 2010-01-15 |
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